In the classic style of “Mystery Science Theater 3000,” Rifftrax brings us several delicious new minutes of mockery focused on “Thor,” the major motion picture starring Natalie Portman and Chris Hemsworth. By the way, this movie had the most amazing script ever, didn’t it? And by “script,” of course, I mean monsieur Hemsworth’s ooh-la-la, six-pack abs. BOOM!